Straight replication is often used when a read only version of an existing datastore is needed or a remote hot backup is desired. The Apply Engine provides an easy to implement simple replication solution requiring very few instructions. It will also automatically detect out of sync conditions that have occurred due to issues outside of Connect CDC (SQData) control and perform compensation by converting updates to inserts (if the record does not exist in the target), inserts to updates (if the record already exists in the target) and drop deletes, if the record does not exist in the target.
Note: This section assumes two things: First, that the environment on the target platform fully supports the type of datastore being replicated. Second, that a Change Data Capture solution for the source datastore type has been selected, configured and tested.
Implementation of Straight VSAM to VSAM Replication requires selection and implementation of the previously described VSAM capture Method. Both the Apply Engine and the capture methods requires a number of environment specific activities that often involve people and resources from different parts of an organization. This section describes the activities associated with the Apply Engine so that the internal procedures can be initiated to complete those activities prior to or in parallel with the setup and configuration of the Connect CDC (SQData) capture components.